Portable mixer



FIG. 1 is a perspective view of the portable mixer.

FIG. 2 is a front elevation view of the portable mixer.

FIG. 3 is a back elevation view of the portable mixer.

FIG. 4 is a left side elevation view of the portable mixer.

FIG. 5 is a right side elevation view of the portable mixer.

FIG. 6 is a top plan view of the portable mixer; and,

FIG. 7 is a bottom plan view of the portable mixer.

The broken lines show portions of a portable mixer which form no part of the claimed design. 

CLAIM The ornamental design for a portable mixer, as shown and described. 